SAT Subject Biology Practice Question 115: Answer and Explanation

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Question: 115

5. A human hereditary disorder that is present only in males is most likely

A. maternally inherited
B. a Y-linked trait
C. an autosomal recessive trait
D. an X-linked recessive trait
E. an X-linked dominant trait

Correct Answer: B


A disorder that is only found in males must be Y linked. An X-linked trait would occur in a small proportion of females.

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